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Sean D. O'Brien

I enable my clients to make pragmatic business decisions based on their business goals and budgetary requirements. I do this by providing candid, thorough information and helping my clients make sense of that information. The ‘sky’s the limit’ approach isn’t usually the best one, so I focus on strategies that would have the most value in the context of the client’s business. Quotation mark
Sean D. O'Brien
Sean D. O'Brien

About Sean

Sean O’Brien assists clients with obtaining, maintaining, and enforcing patent and trademark rights in the U.S. and abroad. He also advises and represents clients in opposition and cancelation proceedings before the Trademark Trial and Appeal Board (TTAB) as well as for post grant review and inter partes review patent proceedings before the Patent Trial and Appeal Board (PTAB). In addition, Sean negotiates intellectual property agreements, including licenses, and he resolves patent, trademark, copyright, and trade secret disputes outside of litigation. Sean also asserts and defends intellectual property infringement matters through litigation.

Before becoming a lawyer, Sean worked as a mechanical design engineer and project engineer at an aerospace company, where he designed, tested, and resolved manufacturing problems for antiskid brake control valves. He also worked in the automotive industry with door seal and wiring harness technologies, which included his first professional exposure to patent law. Sean’s undergraduate degree is in engineering, with a focus on fluid dynamics and thermodynamics.

Drawing on his prior broad experience, he aims to meet his client’s intellectual property goals in a candid, adept manner. Sean leads the firm’s intellectual property practice as well as its renewable energy team.

Representative Experience

  • Technology Plus
    • Defend software as a service (SaaS) provider in trademark infringement litigation resulting in a successful resolution through mediation.

    • Advise manufacturer of video game controllers on patent protection for inventions and trademark protection for brands; clear product and branding ideas; prepare and file patent and trademark applications around the world.

    • Counsel pharmaceutical developer on intellectual property aspects of international license and supply agreement; negotiate and draft aspects of the license agreement.

    • Prepare and prosecute patent applications for developer of portable, pressurized beverage containers.

    • Advise supplier of compostable tableware and containers on all aspects of intellectual property protection and enforcement, including worldwide trademark portfolio, international distribution agreements, and risk evaluation related to intellectual property.



  • J.D., Loyola Law School, 2005
    • Dean's Honor List
    • First Honors Award, Trademark Law
    • Chief Production Editor, Loyola Law Review
  • B.S., Case Western Reserve University, fluid and thermal engineering, 1995
    • Dean's Honor List

Bar Admissions

  • Oregon, 2014
  • California, 2005
  • U.S. Patent and Trademark Office, 2002

Court Admissions

  • U.S. District Court, Central District of California
  • U.S. District Court, Northern District of California
  • U.S. District Court, District of Oregon
  • U.S. Court of Appeals, Federal Circuit

Additional Information

(SITE) IP & Tech Law Trends Contributor


  • Recognized as a “Notable Practitioner” by Chambers USA in Intellectual Property, 2020-present

Outside the Office

Outside of work, Sean enjoys watching his daughter discover the world, skiing, hiking, live music, watching soccer, and learning to play the guitar.

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